Patents by Inventor Chi-Ping Tseng

Chi-Ping Tseng has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Heterocyclic acyl sulfonamides
    Patent number: 4908056
    Abstract: This invention relates to novel heterocyclic carbonyl sulfonamides which are particularly useful as agricultural chemicals.
    Type: Grant
    Filed: February 17, 1989
    Date of Patent: March 13, 1990
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Chi-Ping Tseng
  • Herbicidal pyridyl sulfonamides
    Patent number: 4906288
    Abstract: Certain N-[(pyridyl or pyrimidyl)aminocarbonyl]arylsulfonamides, such as the compound methyl 2-[[N-(3-cyano-4,6-dimethylpyridin-2-yl)aminocarbonyl]aminosulfonyl]benzoa te, possess herbicidal activity.
    Type: Grant
    Filed: November 4, 1987
    Date of Patent: March 6, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Caleb W. Holyoke, Jr., Chi-Ping Tseng, William T. Zimmerman
  • Heterocyclic acyl sulfonamides
    Patent number: 4838925
    Abstract: This invention relates to novel heterocyclic carbonyl sulfonamides which are particularly useful as agricultural chemicals.
    Type: Grant
    Filed: September 25, 1987
    Date of Patent: June 13, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Ping Tseng
  • Herbicidal ortho-sulfamoyl sulfonamides
    Patent number: 4786316
    Abstract: A class of ortho-sulfamoyl sulfonamides are useful as pre-emergent or post-emergent herbicides and plant growth regulants.
    Type: Grant
    Filed: December 12, 1986
    Date of Patent: November 22, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Ping Tseng
  • Lower alkyl 2-[[N-(3-cyano-pyridin-2-yl)aminocarbonyl]aminosulphonyl]benzoate derivatives having herbicidal activity
    Patent number: 4723991
    Abstract: Certain N-[(pyridyl or pyrimidyl)aminocarbonyl]arylsulfonamides, such as the compound methyl 2-[[N-(3-cyano-4,6-dimethylpyridin-2-yl)aminocarbonyl]aminosulfonyl]benzoa te, possess herbicidal activity.
    Type: Grant
    Filed: August 28, 1985
    Date of Patent: February 9, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Caleb W. Holyoke, Jr., Chi-Ping Tseng, William T. Zimmerman
  • Herbicidal ortho-sulfamoyl sulfonamides
    Patent number: 4652304
    Abstract: A class of ortho-sulfamoyl sulfonamides are useful as pre-emergent or post-emergent herbicides and plant growth regulants.
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: March 24, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Ping Tseng
  • Herbicidal sulfonamide inner salts
    Patent number: 4604133
    Abstract: Certain sulfonamide inner salts, such as 2-[N-[(4,6-dimethylpyrimidin-2-yl)aminocarbonyl]aminosulfonyl]benzoic acid methyl ester, dimethylsulfonium inner salt, possess utility as herbicides.
    Type: Grant
    Filed: November 13, 1984
    Date of Patent: August 5, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Ping Tseng
  • Herbicidal sulfonamide inner salts
    Patent number: 4484939
    Abstract: Certain sulfonamide inner salts, such as 2-[N-[(4,6-dimethylpyrimidin-2-yl)aminocarbonyl]aminosulfonyl]benzoic acid methyl ester, dimethylsulfonium inner salt, possess utility as herbicides.
    Type: Grant
    Filed: November 16, 1983
    Date of Patent: November 27, 1984
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Chi-Ping Tseng
  • Fused [1,2,4]oxadiazolylidenebenzenesulfonamides and their use as herbicides and plant growth regulants
    Patent number: 4411690
    Abstract: Fused [1,2,4]oxadiazolylidenebenzenesulfonamides such as 2-chloro-N-(5,7-dimethyl-2H-[1,2,4]oxadiazolo-[2,3-a]pyrimidin-2-ylidene)b enzenesulfonamide and 2-chloro-N-(7-methoxy-5-methyl-2H-[1,2,4]oxadiazolo-[2,3-a][1,3,5]triazin- 2-ylidene)benzenesulfonamide are general and selective pre- or post-emergence herbicides and can be useful in regulating plant growth.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: October 25, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Chi-Ping Tseng